(19)
(11) EP 0 228 583 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.03.1989 Bulletin 1989/10

(43) Date of publication A2:
15.07.1987 Bulletin 1987/29

(21) Application number: 86116675.9

(22) Date of filing: 01.12.1986
(51) International Patent Classification (IPC)4: G21F 9/14
(84) Designated Contracting States:
DE FR GB

(30) Priority: 06.12.1985 JP 275595/85

(71) Applicants:
  • DORYOKURO KAKUNENRYO KAIHATSU JIGYODAN
    Minato-ku Tokyo 107 (JP)
  • Nippon Denki Garasu Kabushiki Kaisha
    Otsu-shi Shiga (JP)

(72) Inventors:
  • Sasaki, Noriaki
    Naka-gun, Ibaragi (JP)
  • Igarashi, Hiroshi
    Naka-gun, Ibaragi (JP)
  • Endo, Noboru
    Naka-gun, Ibaragi (JP)
  • Inada, Katsumi
    Kusatsu-shi Shiga (JP)
  • Nakamura, Toshio
    Otsu-shi Shiga (JP)
  • Takeuchi, Hirokazu
    Kusatsu-shi Shiga (JP)

(74) Representative: Eder, Eugen, Dipl.-Ing. et al
Patentanwälte Dipl.-Ing. E. Eder Dipl.-Ing. K. Schieschke Elisabethstrasse 34
80796 München
80796 München (DE)


(56) References cited: : 
   
       


    (54) An electric melting furnace for glassifying high-radioactive waste


    (57) An electric melting furnace for glassifying high-radio­active waste characterized in that, in a furnace for melting glass containing platinum-group elements which has an outlet of glass at the bottom part of a melting tank, the bottom of the furnace surrounding the outlet has an inclination of more than 30° and not more than 70° with respect to the horizontal plane toward the cullet, and the distance ℓ₁ between a surface-inside opening part of the outlet and bottom ends of at least a pair of electrodes (3a, 3b) for supplying most of power required for glass melting is a half or more, but not exceeding, of the distance (ℓ₂) between the electrodes (3a, 3b).







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